AP Chemistry Summer Review Santa Fe High School
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1 AP Chemistry Summer Review Santa Fe High School Welcome to the wonderful world of AP Chemistry! I m looking forward to the school year and the work we re going to do together. This packet is meant to refresh you on several things you already learned so that you have them firmly in mind for the start of school. Information is also included on the lab notebook you need to purchase and have with you the first week of school. I recommend that you take home your Pre-AP Chemistry notes, and start looking at this material several weeks before school starts in the fall. 1. lab notebook: this is a required purchase. I recommend that you buy this now or at the beginning of the summer, so that you are not competing with college students trying to get their notebooks in August. 2. AP Exam Review book (ie, Princeton Review, Fast Track to a 5, Crash Course, etc): this is an optional purchase. I would NOT get a book during the summer, because publishers usually revise their books. Wait until the spring semester to purchase a review book. 3. Polyatomic ions: the polyatomic ions on page 2 should be memorized. Rather than trying to memorize them by brute force, look at the patterns related to the periodic table and the numbers of oxygen atoms. You already know most of these! 4. Solubility rules: the solubility rules on page 3 should be memorized. This is the same information you got in Pre-AP Chemistry. 5. Nomenclature: the practice sheet on page 4 is a review over basic name and formula writing. You should be able to do these with one hand tied behind your back! 6. Chemical equations: the sheet on page 5 has various reactions for which you have to predict the products and balance the equations. Review your notes on reaction types and products of decomposition reactions for this section. 7. Short answer problems: The practice problems starting on page 6 are a sampling of different problems taken directly from previous AP exams. You already know how to do all of them, but you might not have seen them put together in this way before. This work is meant to get your brain back into Chemistry mode before school starts. We will not spend any time reviewing these things in school I ll just assume you know it all! 1
2 Polyatomic Ions Containing Non-metals and Oxygen Group IIIB or 13 Group IVB or 14 Group VB or 15 Group VIB or 16 Group VIIIB or 17 Charge Charge Charge BO 3 borate CO 3 carbonate NO 3 nitrate NO 2 nitrite O F one member in the ion family Remember: ions with the greater # of oxygens: ATE ions with the fewer # of oxygens: ITE adding hydrogen in front makes BI and reduces charge by 1 SiO 3 silicate PO 4 PO 3 AsO 4 AsO 3 phosphate phosphite arsenate arsenite Charge two members in the ion family SO 4 SO 3 SeO 4 SeO 3 TeO 4 TeO 3 sulfate sulfite selenate selenite telurate telurite ClO 4 ClO 3 ClO 2 ClO perchlorate chlorate chlorite hypochlorite BrO 4 perbromate BrO 3 bromate BrO 2 bromite BrO hypobromite IO 4 periodate IO 3 iodate IO 2 iodite IO hypoiodite Charge Charge four members in the ion family Other important polyatomic ions to remember: acetate C 2H 3O 2 chromate CrO 4 Bisulfite HSO 3 hydroxide OH dichromate Cr 2O 7 Bisulfate HSO 4 permanganate MnO 4 peroxide O 2 Bicarbonate HCO 3 cyanide CN oxalate C 2O 4 Biphosphite HPO 3 hydronium H 3O +1 thiosulfate S 2O 3 Biphosphate HPO 4 ammonium +1 NH 4 tartrate C 2H 4O 6 hydrogen biphosphite H 2PO 3 DG from Stamp 2
3 Solubility Rules 1. All salts formed from Group IA elements and ammonium are soluble. KClO4 is only slightly soluble. 2. All salts formed from Group VIIA elements are soluble except for those containing silver, mercury(i), lead and copper. Lead(II) chloride is soluble in hot water. Mercury (II) iodide is insoluble. The oxychlorides of bismuth and antimony, BiOCl and SbOCl are insoluble. 3. All acetates, nitrates and chlorates are soluble. Silver acetate is only slightly soluble. 4. Sulfates are soluble except for those containing barium, strontium and lead. Calcium sulfate, silver sulfate, and mercury (I) sulfate are slightly soluble. 5. Carbonates, phosphates, hydroxides, oxides, sulfites, sulfides, silicates and chromates are insoluble except for those which contain rule 1 cations. Lithium phosphate is only slightly soluble. Hydroxides of calcium, strontium, and barium are slightly soluble. 3
4 Nomenclature: Name and Formula Writing Practice Formula Name 1. P 4O ZnAt 2 3. SBr 6 4. CaF 2 5. P 2S 3 6. carbon monoxide 7. sodium hydride 8. aluminum selenide 9. xenon hexafluoride 10. dinitrogen monoxide 11. KClO Pb(OH) Ca(MnO 4) N 2O Ti(HPO 4) manganese (VII) oxide 17. francium dichromate 18. copper (II) dihydrogen phosphate 19. silver chromate 20. ammonium oxalate 21. (NH 4) 2SO Ni 3(PO 4) Fe(IO 2) NaBrO H 3PO tartaric acid 27. hydrotellluric acid 28. mercury (I) nitrate 29. vanadium (V) oxide 30. tetraphosphorous decaoxide 4
5 Reaction Completion and Balancing In each of the equations below, the reactants are written correctly. You must write the correct products and then balance the equation. It might be useful to identify the type of chemical reaction before writing the products. 1. CaCO 3 2. Al + O 2 3. Fe + CuSO 4 4. C 6H 12 + O 2 5. Zn + H 2SO 4 6. Cl 2 + MgI 2 7. NaOH 8. Fe + HCl 9. NaOH + H 3PO (NH 4) 2SO 4 + Ca(OH) AgNO 3 + K 2SO Mg(OH) 2 + H 3PO Na + H 2O 14. KClO Al 2(SO 4) 3 + Ca 3(PO 4) SO 2 + H 2O 17. (NH 4) 3PO 4 + Ba(OH) Ca(OH) 2 + HNO C 3H 8 + O Li + S 5
6 Short-Answer Problems (from previous AP Exams) 1. The reaction between silver ion and solid zinc is represented by the following equation: 2Ag + (aq) + Zn (s) Zn +2 (aq) + 2Ag (s) A 1.50 g sample of Zn is combined with 250 ml of M AgNO 3 at 25 C. a. Identify the limiting reagent. Show calculations to support your answer. b. On the basis of the limiting reactant that you identified in part (i), determine the value of [Zn +2 ] after the reaction is complete. 2. Consider the hydrocarbon pentane, C 5H 12 (molar mass g). a. Write the balanced equation for the combustion of pentane to yield carbon dioxide and water. b. What volume of dry carbon dioxide, measured at 25 C and 785 mmhg, will result from the complete combustion of 2.50 g pentane? c. The complete combustion of 5.00 g of pentane releases 243 kj of heat. On the basis of this information, calculate the value of ΔH for the complete combustion of one mole of pentane. 3. A student is asked to determine the molar enthalpy of neutralization, ΔH neut, for the reaction: H + (aq) + OH - (aq) H 2O (l) The student combines equal volumes of 1.0M HCl and 1.0 M NaOH in an open polystyrene cup calorimeter. The heat released by the reaction is determined by using the equation q = mc ΔT. Assume the following: Both solutions are at the same temperature before they are combined. The densities of all the solutions are the same as that of water. Any heat lost to the calorimeter or to the air is negligible. The specific heat capacity of the combined solutions is the same as that of water. a. Give appropriate units for each of the terms in the equation q = mc ΔT. b. List the measurements that must be made in order to obtain the value of q. c. Explain how to calculate each of the following. i. The number of moles of water formed during the experiment. ii. The value of the molar enthalpy of neutralization, ΔH neut, for the reaction between HCl (aq) and NaOH (aq). d. The student repeats the experiment with the same equal volumes as before, but this time uses 2.0 M HCl and 2.0 M NaOH. i. Indicate whether the value of q increases, decreases, or stays the same when compared to the first experiment. Justify your prediction. ii. Indicate whether the value of the molar enthalpy of neutralization, ΔH neut, increases, decreases, or stays the same when compared to the first experiment. Justify your prediction. e. Suppose that a signification amount of heat were lost to the air during the experiment. What effect would this have on the calculated value of the molar enthalpy of neutralization ΔH neut? Justify your answer. 6
7 Short-Answer Problems (from previous AP Exams) 4. Use the principles of atomic structure and/or chemical bonding to explain each of the following. In each part, your answer must include references to both substances. a. The atomic radius of Li is larger than that of Be. b. The second ionization energy of K is greater than the second ionization energy of Ca. c. The carbon-to-carbon bond energy in C 2H 4 is greater than it is in C 2H 6. d. The boiling point of Cl 2 is lower than the boiling point of Br A student is given the task of determining the I - content of tablets that contain KI and an inert, water-soluble sugar as a filler. A tablet is dissolved in 50.0 ml of distilled water and an excess of 0.20 M Pb(NO 3) 2 (aq) is added to the solution. A yellow precipitate forms, which is then filtered, washed, and dried. The data from the experiment are shown here: Mass of KI tablet g Mass of thoroughly dried filter paper g Mass of filter paper + precipitate after first drying g Mass of filter paper + precipitate after second drying g Mass of filter paper + precipitate after third drying a. For the chemical reaction that occurs when the precipitate forms, i. write a balanced, net-ionic equation for the reaction, and ii. explain why the reaction is best represented by a net-ionic equation. b. Explain the purpose of drying and weighing the filter paper with the precipitate three times. c. In the filtrate solution, is [K + ] greater than, less than, or equal to [NO - 3 ]? Justify your answer. d. Calculate the number of moles of precipitate that is produced in the experiment. e. Calculate the mass percent of I - in the tablet. f. In another trial, the student dissolves a tablet in 55.0 ml of water instead of 50.0 ml of water. Predict whether the experimentally determined mass percent of I - will be greater than, less than, or equal to the amount calculated in part (e). Justify your answer. 7
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